Water-tube boiler.



No. 634,978. Patented Oct. I7, |1899.

M. P. BOSS.

wATEn TUBE BolLER.

(Application led Jan. 17, 1899.)

(No Model.)

I' I u i narnia STATES MARTIN I. BOSS, OF` SAN FRANCISCO, CALIFORNIA.

WATER-TUBEBOILER.

SPECFICATIONforming part Vof' Letters Patent N0. 634,978, dated October17, 1899. Application filed January 1'7, 1899. Serial No. 702,428, (Nomodel.)

To @ZZ wwm it may concern.'

Beit known that I, MARTIN P. Boss, a citizen of the United States,residing at San Francisco, in the county of San Francisco and State ofCalifornia, have invented certain new and useful Improvements inlVater-Tube Boilers; and Ido herebydeclare that the following is a full,clear, and exact description thereof.

The present invention relates more especially to the construction of thelines of water-tube boilers, and more particularly to that character ofboilers fully shown and'described in the application for Letters Patentfiled by me in the United States Patent Oiice on .the 26th day ofSeptember,v 1898, which application bears Serial No. 691,932.

In my aforesaid application forLetters Patent the i'lues within whichthe water-tubes are arranged areV so constructed as to permit the flameto ascend and descend without obstruction, and as a consequence I haveascertained by practical working that the circulatory Water does notreceive the full benefit of the heat of the iiame or products ofcombustion surrounding or enveloping the water-tubes.

The object of the present invention is to create a saving in fuelrequired to properly heat the water circulatingr through the water tubesand cylinders of the boiler, while at the same time-obtaining themaximum efficiency of the hot products of combustion carried through thefines; and itV consists in so arranging the lines that the flame orproducts of combustion will be somewhat retarded during travel from thefire-chamber to the chimney and be driven against the water-tubesthroughout the entire length thereof. To this end the flue-walls aremade zigzag or staggered, so that the flame and hot products ofcombustion will be arrested as carried therethrough and deflectedagainst the water-tubes arranged therein. By thus impeding the flamesand hot products of combustion during travel the. heat is confined for alonger period Within the iiues, and the same is better directed againstthe water-tubes grouped or nestled therein, thus acting as though theheatingsurfaces of the watercirculating pipes were increased.

In order to comprehend the invention, reference must be had to theaccompanying sheet of drawings, forming a part of this application,whereinfp Figure l is a vertical cross-sectional view of the boiler7 thesame being taken through the fire-chamber and first series of tubes.Fig.2 is a similar view of boiler, taken through the last series offlnesandthe base of the chimney; and Fig. 3 is a longitudinal cross-sectionaltop plan view taken on line nc fr, Fig. l.

In the drawings the lettersA and B are the two cylinders connected bytheseparated series or groups of tubes C G.

D is the fire-chamber, and F the base of the chimney.

The group of tubes C and C', it will be noticed, are separated by a wallH, which forms the dues D D2, Within which the groups of tubes C C arelocated. At the upper portion these flues are enlarged or widened out inorder to provide or form a' flue F in proximity to the upper cylinder B,said widened flue extending across the two series or groups of tubes,thus providing ample capacity for .the hot currents to pass from seriesC to series C'.

The foregoing parts are the same in arrangement and operation as thecorresponding parts set forth and described in my aforesaid application,Serial No. 691,982, to which reference is hereto made. Hence detaileddescription thereof is deemed unnecessary in the present application.

For the purpose of retarding the travel of the fiame and hot 4productsof combustion through the water-tube iiues D D2 in order to confine thesame and drive it during travel directly against the group or series oftubes C C, located therein, each flue :is constructed with theinwardly-projecting shelves or shoulders l 2, which are so arranged asto alternate from side to side of the line. The clearance or passage-waythus left between the watertubes and the inner wall of the fines is ofsuch a character that the dame or hot products of combustion will nottravel in astraight line, but be deflected from side to side duringtravel thereof through the flues within which the water-tubes aresituated. This construction -of the walls of the flues D' D2 causes theflame or hot products of combustion to travel in a zigzag or staggereddirec- IDO l heat to be obtained by such retardation of the flame or hotproducts of combustion within the tlues. Where the llame or hot productsof combustion simply envelop the water-tubes and ow or travel throughthe flues uninterrupted, much heat is lost to the circulating ,waterwithin the tubes, which is recovered or conserved by constructing theflues as herein described, as the llame or hot products of combustionare forced to flow in a zigzag, staggered, or serpentine pathway andduring the entire travel constantly thrown against the water-tubessituated Within the ues. Consequently with the same amount of fuelbetter results are obtained by this construction of the lines thanwherethe tubes are simply enveloped by the fiame or hot products ofcombustion, hence permitting the boiler to be worked more economically.This feature is of importance in this class of mechanics and will behighly appreciated by users in such portions of the country where fuelis exceedingly expensive or high.

In operation the travel of the 'dame or hot products. of combustion fromthe fire-chamber D to the chimney E is the same as that described in myaforesaid pending application, Serial No. 691,932, excepting that thesame travels through the flnes in a zigzag or staggered direction, asindicated by arrow 3- 't'. c., the same is lirst drawn against shoulderor projection l, thence deflected against vshoulder 2,' thence upwardagainst second shoulder or projection l, and so on upward through thefirst line C, being drawn across through flue F and downward throughflue C toward the chimney, during its downward travel alternatelyimping'ing against shoulders or projections 2 l.

While the travel of the dame or hot products of combustion is retarded,the shoulders or projections l 2 are so arranged proportionate to thelength of the flues C C as not to interfere with the draft of thechimney.

Having thus described my invention, what I claim as new, and desire tosecure protection in by Letters Patent, is-

Tl. A Water-tube boilerhaving a plurality of series groups or nests ofwater-tubes connecting two water-cylinders, said series groups or nestsbeing separated and their spaces in which they are confined formingfines which communicate successively to give alternate currents inopposite directions,each flue being provided with shoulders on itsopposite sides extending transversely of and substantially into contactwith said Water-tubes, the shoulders on one side being staggeredrelative to the shoulders on the other side, whereby the llame orcurrent of hot products of combustion is caused to travel in a zigzagdirection through said Water-tubes, substantially as described.

2. In a water-tube boiler of the described character, the combinationwith the watertube space, of a partition subdividing the saine intodistinct flues, a series or group of water-tubes located in each flue, astaggered, zigzag or serpentine passageway for the flame or hot productsof combustion in each water-tube iiue extending longitudinally of saidwater-tubes, and of a connecting-flue for the said water-tube fines.

3. In a water;tube boiler of the described character, of a plurality ofwater-tube fines, a series or group of water-tubes located in each tine,a series of shoulders or projections secured to the side walls of eachtine at points diagonally opposite each other and extending transverselyof and substantially into contact with the water-tubes so as to form azigzag, staggered orserpentine pathway between the water-tubes and theWalls ot' the flues through which the flames or hot products ofcombustion are conveyed, and of a ue forming connection between thewater-tube flues.

Ll. The combination with a water tube boiler, of a furnace having a fluewithin which a group of the boiler-tubes is located, the opposite innerwalls of said tine being provided with inwardly-projecting shoulders orledges extending transversely of and substantially into contact with theWater-tubes, those on one wall being staggered with relation to those onthe opposite wall, whereby the products of combustion will be caused tofollow a zigzag path through said flue, substantially as described.

In testimony whereof I affix my signature, in presence of two witnesses,this 31st day of December, 1898.

MARTIN P. BOSS.

/Vitnesses:

C. F. PATToN, W. H. ARMSTRONG.

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